How many cavers are there in Europe ?

A while ago, I was wondering how many we were to be passionate about caving and speleology.
There were no direct answers so I contacted the resposible of national federations. This gave me these data.
Interesting !

Please note the heterogenous nature of these numbers. In some countries, only the affiliated cavers are counted, in other countries, we have an approximation.
Then, in some countries, caving is closely linked with formal university research whereas in other country, it is mostly a hobby, and sometimes the clubs mixe caving with mountaineering, hiking, climbing…
Sometimes, there are 2 caving federations in the country and we got partial statistics.

Please do not hesitate to contact me to update the numbers, or correct them.